Specifications

AN93
74 Rev. 0.8
U37–U45 (Pulse Dial Registers)
Registers U37–U40 set the number of pulses to dial
digits 0 through 9, respectively. (See Table 40.) The
values are entered in hexadecimal format with digit 0
having a default setting of 0x000A (10 decimal) pulses,
digit 1 having a default setting of one pulse, digit 2
having a default setting of two pulses, etc. This pulse
arrangement is used throughout most of the world.
There are, however, two exceptions—New Zealand and
Sweden. New Zealand requires 10 pulses for 0, nine
pulses for 1, eight pulses for 2, etc. Sweden, on the
other hand, requires one pulse for 0, two pulses for 1,
etc. Complete information is provided in "Country
Dependent Setup" on page 124.
U42, U43, and U45 set the pulse dial break-time
(PDBT), make-time (PDMT), and inter-digit delay time
(PDIT), respectively. The values are entered in
hexadecimal format and represent ms units. The default
values meet FCC requirements. The default dialing
speed is 10 pps. See "Country Dependent Setup" on
page 124 for Japanese 20 pps dialing configuration.
U46–U48 (DTMF Dial Registers)
U46–U48 set the DTMF power level, DTMF on time,
and DTMF off time, respectively. (See Table 41.) The
DTMF power level set in register U46 is a 16-bit
hexadecimal value with the format 0x0(H)(L)0. Where H
is a hexadecimal number (0–F) for the dBm level of the
high-frequency DTMF tone, and L is a hexadecimal
number (0–F) for the dBm level of the low-frequency
DTMF tone. The difference between the level of the
high-frequency tone and the low-frequency tone is
called “twist” and can be set with the choice of the H
and L values in –1 dBm steps. The DTMF output level is
0 dBm for each tone if U46 = 0x0000 and –15 dBm if
U46 = 0x0FF0. The default power level is –9 dBm for
the high tone and –11 dBm for the low tone.
U47 and U48 set the DTMF on time (DTNT) and DTMF
off time (DTFT) respectively as a hexadecimal value
with ms units. The default value for both U47 and U48 is
100 ms, and the range of values is 0–1000 ms.
Table 39. Dial Tone Timing Register
Register Name Description Default
U34 DTWD Window to look for dial tone in seconds multiplied by 1000 0x1B58
U35 DMOT Minimum dial tone on time in seconds multiplied by 7200 0x2D00
Table 40. Pulse Dial Registers
Register Name Description Default
U37 PD0 Number of pulses to dial 0. 0x000A
U38 PD1 Number of pulses to dial 1. 0x0001
U39 PD2 Number of pulses to dial 2. 0x0002
U3A PD3 Number of pulses to dial 3. 0x0003
U3B PD4 Number of pulses to dial 4. 0x0004
U3C PD5 Number of pulses to dial 5. 0x0005
U3D PD6 Number of pulses to dial 6. 0x0006
U3E PD7 Number of pulses to dial 7. 0x0007
U3F PD8 Number of pulses to dial 8. 0x0008
U40 PD9 Number of pulses to dial 9. 0x0009
U42 PDBT Pulse dial break time (ms units). 0x003D
U43 PDMT Pulse dial make time (ms units). 0x0027
U45 PDIT Pulse dial interdigit time (ms units). 0x0320